Thus your link verifies what I said.
And believe me, you can make a good bit more than 30K and still pay no federal income taxes. The tax code is so insane, there are all sorts of loopholes, and deductions. But you only addressed one little point of what was said.
Do you yet understand that the very rich are paying at a different rate for a reason? Do you yet understand that as far as 'wage earners' go, the more you make the higher the rate?